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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41fc38e74723d50e8dcdae4e4c460a2b761614cda2b0ef0f41d33afa0432ffba' 
  AND token = 'CizdqXL6Q2Dvtcwoy45r6WMLsiJGKDIOLwAeO/1BCgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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