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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16991504000e5d89a7148afc38bf92c5b53dcc79e315c64c2ff9b435cf4a6ed9' 
  AND token = 'Appp99i1yArkNIirU+pu3bRCnhmqNZ2Xlu8bvAJnJzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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