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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c3cb5d5851ff960965b8c3cc71733274d4ec8fc56c9f32fc7784960c5529be' 
  AND token = 'vjE1WV5Srm29GDoHNmLnjxA7KVDnDgv6N85QY2V/ojA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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