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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e1c71aab87a07055287618fcabeae6f3cb76cfb0fe1db75d1642d4b248519d' 
  AND token = '9D9FsJemS0hFXkB1rbJE3IMnESmZ/2mThInKvibXVTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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