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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803fde69ff2b49ea8f832ad2be2c425d3c3d485ab09f23fa531c6f3d0549bbd1' 
  AND token = 'Jednr+8Lhf+gsKqWyVTQ6WIH2ZE0o0ZsZoJOnHD1hZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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