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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e2e83701d9220a56b256e613887771616ee11d8fe6ea6ab78e016c8cec50d4' 
  AND token = 'DHVdK58GXqvIuYYymX7DTzlQ6FVh4+0LVye100kSRYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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