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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923e962cd04c4ecf5556360cbf2e518c6dcedefa8f1500154757d0667cb7c33f' 
  AND token = 'qYtY5HnV7JZlaGUgMcnn5gI3nZzibmdwqp1V02Rm804=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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