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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0e4b7413bba15cc3c357835118da77252e8177a5f6f4258b4e6d19155f41cd' 
  AND token = 'ToqAkIOhsld3WOWOltpNLIfWkL9MJNzg1Pmw1meiDWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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