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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e80a7c6d2a78f94cdbb83f1bfa5acd64935151945987479a2077af44eb8a3a32' 
  AND token = '2S98eiDhyMQHKMH9EuVfWnHetTaMoBKVM0ZZkBrUbwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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