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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88058665ab7c14df769faa87662f543adfb40554395f06b4d04c6040f4b7889b' 
  AND token = '3O4Ga3bkl9c1E8KZ9dgz2N6r/loiH2ZkRSvQXYPdTWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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