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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce5969de07fc79ad7fe633937f9a7a2e7c9c203b313e32b8e4032a285ffa405' 
  AND token = '+VA15p+OHcdYRVUhCnX42CQ6ZGM54K/9Dm0D5vlFdjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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