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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eedd4026718d323b175e5d8db71a29b20661423416d33cad9b5583e84d3bfe9a' 
  AND token = 'vP2xE6X61E/egiRLG73Sxs8Ln+m1wIJ9W2Gn6K0g6lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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