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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e256c2fdcc29375ec2f1427d91deddc8e210e638d155f4687cd0922687376c96' 
  AND token = '4USxJ9bqfLaDBNHabwnCebAPXQht/Arz8k3puz6Bfcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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