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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25b72d3aebb22b857b7d7ad8baa5d545ebd86d388bce387d81404debbdd6861' 
  AND token = 'TR9vC96QnBXSMAXqKw3H41bOzLaBm7ebvjBT62gUbF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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