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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb720ebd3ddb15202515c0e5d174c1d19904cdbc0412b036a7fcd739df33188' 
  AND token = 'HvPKkvrnAyxTK6bIYLl2JpXfGOqrh4g0cEb0vJoHuw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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