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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a80e07371241d9b6e0b357c55e916c2b6c239853da97c5c08665606e76d5fb' 
  AND token = '7jIP+G+oFy4KR5g/Tqtg4t90KbSNBESiVESL9fK1IF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}