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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2819530f9e548e2a9e56fbc05f6359569d760f5867efd2f484b52afcf77209' 
  AND token = 'RpiYiaPtIOWqQbSZzFZUA1Ox6U9e1CLMMc6QVrAox/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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