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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e28a749bd270839a572f6dbafdbe5b92c2b19cd411ccfe9a34fd00e5b57d26' 
  AND token = 'xdRe9DSWNikElVcrlai7wbvZdB6B6Xxfa/fEssgA2XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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