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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b830132696b9582b4b7562ea28803225b7802d447c8a572e44b5a5f3cfd37a' 
  AND token = 'RSnPYUOQOj14qCELRB+zkkA3gvUnKbII8MJPI0EBW5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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