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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f94b5322f7169b224a41b55a2beb68162c6cedb2d442a6a1f887b549deed66' 
  AND token = 'xP5dLnWJ2XJvW2/gi27Me6zPfQhkKu48No4bXHDfdnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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