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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98670819fb6bb17903bffeb9c47b01c37999208ae6cf7556be1f7761671df058' 
  AND token = '5CvHgF+2aUOf0thcdbTfko81almV0TLKKDtmbhlLoqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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