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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e763dd419d2813d87d2ae08c2d0de551c18d6550d5b33130d7c6c2edaf79b422' 
  AND token = 'Vadbx83jPd4lttuqvDLVqnIxvO14N6OUaUMVAUM4wBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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