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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc61fde051f5abdc909304e2bd1fbeab3cb9ec6075f3d82afe1206b7eefa1e6' 
  AND token = 'DbD66AmSasWtMLvsEcnb7Wk5X81nY+lpmdjazsM2mX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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