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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5df4326f85eef336f720ac083e6b9f8ae0b1e044a3d020053f5a8c65e7756a4c' 
  AND token = 'QMN7/gUa8FtKlNYDxNvwml38b3bOS3zUoJBx1eKVquY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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