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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566acb51e525712392a29889bbdea33028dedd53d7a3229111c2cde5389ad4b8' 
  AND token = '8pVJRJSfph01DDaGGc5XxyXT7haP+cSaMiqtjMSE9u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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