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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2420cbcdf8f0f227682058d68d02f3a74ab288e79a570ecd59febb66cd6f768' 
  AND token = '8nHOKtX3takVEd8YuDkkWLY9wPDYOqRsHeCsYr0Bt4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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