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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23208ffcc524958520586bd185c6b238c11d80d7c32db1340fc361d266f487f' 
  AND token = 'c79QCMMXZK7ZmJRx5jZYfb8yZ4/m9YZX1IKfAiTzGJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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