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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6a490276a11e53d1a228895264659606fd9a6cf5fe56bc26fb8e0d05d50d9b' 
  AND token = 'GMWUIkG2+h6ggOlLvmgwGjTkVJhrItDu5v0fLPNprzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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