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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ee4ebdae4b9e1205418ee85a3205c7603f668d4d832456c229f15f4233ed71' 
  AND token = 'hjS8gco3EoAf1GMg6UKHNl4gkOPswwK73Lj0n6CtWD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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