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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d8df0afa26fd6d87300cda7ce32a1d58d01a0ade85cc67d17c9b000d840e3a' 
  AND token = 'Umv1ANoqlwOj+S68c1OI95X3tNCPL/+L+g3YLJfNG6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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