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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce89dfa3d52a7bfbd1940c9857470538aac47399cb6112f04312c104b80bd85' 
  AND token = '4CYdlfjRAyE6G3i4gEjEn15uh/Quq9trnV/2SRql37M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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