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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8d02779408ed8a1a4bddf2f7b9160b5f9ef7bd8566439ef161107a0cae3979' 
  AND token = 'areYZxHBFY90mzbYKnoaFA8kRFypg6IeqkJNSQxoQ/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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