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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d51a3318fcfe2bb1f78a5bdd6c7be9ef002ec28339b135d1b4467f22d77837' 
  AND token = 'iciAI1Ef6dRXEIYB65PmZ28NqRlSuLaGZC4K3v4R/1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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