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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3be7060e8a7d3ef356d3500ce44bd3acbc15db68e60a9320b50ad9fa9297f8c' 
  AND token = 'tXY/cSf6GrfDl4Kox5B9AABPsnswdzPHu4TuXaJ7MHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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