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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d4ccd3e133d06903a36ef8d41ee0b06effaf9a7022352cc2a10d8fde065d12' 
  AND token = '7xgvd7MhOHRJoPAHoU+UOpQsvtNkWNu1rx0b+LFFRmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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