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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82af3028fd51cf7bf622056fb8450d44ed49dd05a3f19508bf3f508203af64fa' 
  AND token = 'jP0uWo1mlSqEMCX74xf/XFGkb+rVshaNNrTBkLmTHFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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