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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9effc814667c8bdfcb231ec041bbe421f81091e8ef6d48e7e26446829f634a' 
  AND token = 'n0k7HWtEJigxny+JTVzjuzOtL8ne7n0p9Igywn8SWzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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