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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c0a775c638743e43689d4a8619a8fa492aec9b87afac2ffd4c55deb893370c' 
  AND token = 'W327Ere98VfBiGL49A5HBie2Gpx16tbe5YhyHnA5Oi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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