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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e8a92bf6e9e82ff52d0b997a793826fbc4ccc1798e6f6efdedbd76f7f4ab71' 
  AND token = 'G0NB9g/OSwomQlNkF2wKOKMArXlcs4bMm5Oojua6yaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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