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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d07677b47d908d0eab235ae8860ee03b3c6d8c3bda4b09dad64e4a02459954a' 
  AND token = 'w5DEKXbRX7eJsbvciXo9Wh1DQyFF6do9wSIPSLS1wRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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