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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ec5036469f636a039d15d7fb2ed9f751fe674590b21047527b55c5101798aa' 
  AND token = 'qODno6cYTz92nv+M4zylrzA8z6sOh3Lich7R3pMX4zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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