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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cbd56f585227a9ae3ef16963ded236151c0089483e3bb32c7da4ae392583d9' 
  AND token = 'R1Gjb8+IiOnm4FUTSseGAr5HlHP/HpHO/bkd4Q4ap04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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