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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb37c6b08574326c4f3d348d2ffa18b67bd220d4459a79e67b9287060460b4f3' 
  AND token = 'mln1x13YM2DrqelFahY20QUGjD6J9+LtfQyqNNQG3jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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