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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0856f11250d0041fc8dc6a7d19cd3fd87daaf3fc38c78e3b15053af7f5f28de' 
  AND token = 'z7U2EVRuumKPORC5t/Gro+lbLWVJa/w7YeDjuVKeeRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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