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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d093e98b2c6266439c3bc1794fc3ce4d2c67fcfd2d4cd5221757d75ec295af7' 
  AND token = 'TB6yJQpemadQ/w32X/xvJ1VPziepMa6UehdWRhzQQCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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