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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0146c430b6ba3f949fa6fc283ab5e8bdad01ec9a8c51e9b05934b3a6d5f9855e' 
  AND token = 'rVaHPeyp/JeGxajX5PZNOuYuICQOh53cOYBp+YIQ6Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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