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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24d67bc93caac6bf0f4f12c8adbbb7d44b34ee4a537dbaf2616b57884c50925d' 
  AND token = 'KF32xf4DtztXSG3kZMZAt6oTR5n4ynUT59q6DmjYn1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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