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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85ff3421c720b3e01f625a8ea8c27bb78c6d06287b6f7d2457cc0baae33a882' 
  AND token = 'kdqImBw3PoF7Wip7TxM+nrSFlehHw9eGlR7Q4kEUQus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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