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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '443d41db0e3d73f14da1cf708267ea458f2ea6987e9747aff3d26fcd3c41a93f' 
  AND token = 'uzsyMHLedpZEPeUTP3HSo9DqK95UMZ0/j/PxGfNg1SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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