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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd31bf6cc40afc3c961d708d7b0a56417ef122ffc90a4dff6d4ea5d5fe4bdf4' 
  AND token = 'c04uo4FRChjyEZ/qFvIL4KcXrIi6xT3CYk15ge96kCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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