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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c70b4335a5152a7d304a279e86e303d539c28b003eb67cecde5f636584dca1' 
  AND token = 'pCDLhU9IPT0Xm6whdMjM2T+IKazwn61IRwPhYqJ8/TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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