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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5606458d3b354c3eac53d57e01545456acf0477a73ea9b49785909c320b4b45' 
  AND token = 'ZD9yfEDUSWmKrU4qQ5OO4UbafPCgR3FKAxP/DnFjOr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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