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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '071df86262eb446983064a049e1f29462217e002f09b5d0485a3a3324776a1a6' 
  AND token = 'Jqu32UmzFJzB6wXHUPuEfLAy4EZ7SoZ37UJkz74IEWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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