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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5763a1ec9fbf7a08956d3a1e0f07586501a15db44e709b4f752fc8edffe524bf' 
  AND token = 'ugLgNEfhMngtC226DmHYHP4DnrFHY/DokUXUa+K43Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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