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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc9b35cff8a80f0961c3789adcb8c3a002371af3bef12d610739b3ab6f465d1' 
  AND token = 'cgcFFTZKdF2/7n4iTl2Frp5xGdzO29nTtBxlGpP6E0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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