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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd27e15157d626de3d1672130a3bdd6c5046a3aa023facae0466b6b34018c8d' 
  AND token = '3NJ5WWY9FjPMpBpwoNo4g93L/rXM+jOgCQALNtQDh+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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