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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d51116d2e43a399b65d9e5019b086902d44f6feab8f93475b99c34b64c460f2' 
  AND token = 'ENR287mLJ3mMQKT7Q5XrOv9J/abZHML9XlEOG9XC2Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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