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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ff93a2fc8b6b56ba5e990201a2223a1e70a25b7bab1e14addebf992b3ef855' 
  AND token = 'i83rtGDOgCXJAP5PXsqbencWBaKQzk2+Ja3+++OP/I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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