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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b323b51d6e8cc27cb85e87b24473fc94ede5cdd3ea4100307f673fc9e2fc4c5' 
  AND token = 'akF0LqH74Ux2jAG7TnJGAybI+eqUtJpvZ4SAE9G+kDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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