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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74c30aebebfa9d34ae0e29280610e5e34d1019f532d7c88b2c74f391fd40d68' 
  AND token = '8TD2+r0aYSffxb4EA8l49CiH7l+cwPs6+T/NQUsI2XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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