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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475928039fd4d4edbdc78ca99b614e9dc58df4770d5738c74192e87e778b51c0' 
  AND token = 'tJEJDOe2gZS6APbqFCkMljQou66kedj1ZuiGGhVjAFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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