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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54afec5851c73b589ad557c5ceeaa0ddc2aa471c043cd6a9d270ffa7642b1ce' 
  AND token = 'G/rYoKKceyoX+8oRneEc+7YU8aPuKEuTpL5nkyIeAFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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