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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbb061efed83d23753230e519763d6b2b62ed7bc399d55b0ddc923fbcc1a622' 
  AND token = 'oESwQFNTn0IMDX2z/8zRXVmTc9iD59/vSEQXvv1OL00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00261

JSON explain

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