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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70bf9128588cd0aff49068199435a44a74c1fae5662665488158034cebd5606b' 
  AND token = '2Nb88jBIr0KI2lnCfIhWKVz3pOA1jJUHJTHEQS+CFLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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