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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4a15ba12c362aa9ba41e3975dc3e9b2b740ffe9fcbd5655f279f2f9bd0335c2' 
  AND token = '05qrxL9ckfcW41vVlDe6j3V8MJQm2kaG8omOM81A9VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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