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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c35b5bd0e24f3b5ac34ff3141003ff1e05e73d1dcc4f80bace7c94faf7a0faa' 
  AND token = 'jtHdO1A3Yi6wLSh9LCI7B/WBTGAJCb8JWVdscf6XDP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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