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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6c6afc9f0a4dc8f434dda861e2538eaa8974900f556f296874778946fc457b' 
  AND token = 'Ujqew5WKa9D2oJCgSr0+hlnq325atijSaknEUJiL0XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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