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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb87f0cc2e607183da3429686ebddce69dd093646556fae791a6065869a9366' 
  AND token = '35fJyqSFjHWU2SCk/tt/760iuM0WoSLd/n6dfGjYW4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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