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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b72dfc9d55d2721b3aeb598ed02baf60ac7801566264dd2e11ab44fc5e05304' 
  AND token = 'E9lwsJH8r6Fub32R+eJz7fCxP05a1yPhzToNo87YURs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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