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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e911850ebb71d929f81bd756bac6db2ffeb44f280d4e393704243789ce4fa81' 
  AND token = 'OeM0+EQJ6lHBeN31dxza90KQf3N+1KkC0yBx+FyNNQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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