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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4af7b267e7666ca90dcb80f0cb98dbbe05a007bc7dff4590e930154e79139e' 
  AND token = 'CNXur+0rKXD3carEMPAGYwB4G2o264uLgI7PKc33Jt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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