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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33236148fa5cd4b18f7a193451d283fb8b712ead4734757ce29e8f0192de6960' 
  AND token = '+IZejaWCKAcWGC1yzZp5DqR503a5U/RSfFVt5I/jboE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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